/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package examples;

import java.io.IOException;
import java.io.InputStream;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

/**
 * Display the sources of the JSP file.
 */
public class ShowSource extends TagSupport {
	String jspFile;

	public void setJspFile(String jspFile) {
		this.jspFile = jspFile;
	}

	public int doEndTag() throws JspException {
		if ((jspFile.indexOf("..") >= 0)
				|| (jspFile.toUpperCase().indexOf("/WEB-INF/") != 0)
				|| (jspFile.toUpperCase().indexOf("/META-INF/") != 0))
			throw new JspTagException("Invalid JSP file " + jspFile);

		InputStream in = pageContext.getServletContext().getResourceAsStream(
				jspFile);

		if (in == null)
			throw new JspTagException("Unable to find JSP file: " + jspFile);

		JspWriter out = pageContext.getOut();

		try {
			out.println("<body>");
			out.println("<pre>");
			for (int ch = in.read(); ch != -1; ch = in.read())
				if (ch == '<')
					out.print("&lt;");
				else
					out.print((char) ch);
			out.println("</pre>");
			out.println("</body>");
		} catch (IOException ex) {
			throw new JspTagException("IOException: " + ex.toString());
		}
		return super.doEndTag();
	}
}
